Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: quantos 2º viii abertos teve u15 3º iv sendo gt
 ###Tabelas: CREATE TABLE hydro_power_stations (hydro_power_stations_id AUTO_INCREMENT PRIMARY KEY, S.no. INT, Power Plant VARCHAR, State VARCHAR, Commissioned Capacity (MW) INT, year of commission INT) CREATE TABLE main_countries_and_territories_data (main_countries_and_territories_data_id AUTO_INCREMENT PRIMARY KEY, Country / territory VARCHAR, Area (km²) INT, Population INT, Pop. density (/km²) INT, GDP millions of USD (2009) INT, GDP per capita USD (2009-2011) INT, Capital VARCHAR) CREATE TABLE number_of_olympic_games_by_country (number_of_olympic_games_by_country_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Country VARCHAR, Continent VARCHAR, Summer Olympics VARCHAR, Winter Olympics VARCHAR, Total INT) CREATE TABLE 1971 (1971_id AUTO_INCREMENT PRIMARY KEY, Opposing Teams VARCHAR, Against INT, Date VARCHAR, Venue VARCHAR, Status VARCHAR) CREATE TABLE winning_head_of_the_river_championship_events (winning_head_of_the_river_championship_events_id AUTO_INCREMENT PRIMARY KEY, Crew INT, Open 1st VIII VARCHAR, Open 2nd VIII VARCHAR, Open 3rd VIII VARCHAR, U16 1st VIII VARCHAR, U16 2nd VIII VARCHAR, U16 3rd VIII VARCHAR, U15 1st IV VARCHAR, U15 2nd IV VARCHAR, U15 3rd IV VARCHAR, U15 4th IV VARCHAR, U15 5th IV VARCHAR, U15 6th IV VARCHAR)  
SELECT COUNT Open 2nd VIII FROM winning_head_of_the_river_championship_events WHERE U15 3rd IV = GT